// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/views/mus/aura_init.h"

#include <utility>

#include "base/lazy_instance.h"
#include "base/macros.h"
#include "base/path_service.h"
#include "build/build_config.h"
#include "components/resource_provider/public/cpp/resource_loader.h"
#include "mojo/shell/public/cpp/shell.h"
#include "ui/aura/env.h"
#include "ui/base/ime/input_method_initializer.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/base/ui_base_paths.h"
#include "ui/views/views_delegate.h"

#if defined(OS_LINUX) && !defined(OS_ANDROID)
#include "components/font_service/public/cpp/font_loader.h"
#endif

namespace views {

namespace {

    std::set<std::string> GetResourcePaths(const std::string& resource_file)
    {
        std::set<std::string> paths;
        paths.insert(resource_file);
        return paths;
    }

    class MusViewsDelegate : public ViewsDelegate {
    public:
        MusViewsDelegate() { }
        ~MusViewsDelegate() override { }

    private:
#if defined(OS_WIN)
        HICON GetSmallWindowIcon() const override
        {
            return nullptr;
        }
#endif
        void OnBeforeWidgetInit(
            Widget::InitParams* params,
            internal::NativeWidgetDelegate* delegate) override
        {
        }

        DISALLOW_COPY_AND_ASSIGN(MusViewsDelegate);
    };

} // namespace

AuraInit::AuraInit(mojo::Shell* shell, const std::string& resource_file)
    : resource_file_(resource_file)
    , views_delegate_(new MusViewsDelegate)
{
    aura::Env::CreateInstance(false);

    InitializeResources(shell);

    ui::InitializeInputMethodForTesting();
}

AuraInit::~AuraInit()
{
#if defined(OS_LINUX) && !defined(OS_ANDROID)
    if (font_loader_.get()) {
        SkFontConfigInterface::SetGlobal(nullptr);
        // FontLoader is ref counted. We need to explicitly shutdown the background
        // thread, otherwise the background thread may be shutdown after the app is
        // torn down, when we're in a bad state.
        font_loader_->Shutdown();
    }
#endif
}

void AuraInit::InitializeResources(mojo::Shell* shell)
{
    if (ui::ResourceBundle::HasSharedInstance())
        return;
    resource_provider::ResourceLoader resource_loader(
        shell, GetResourcePaths(resource_file_));
    CHECK(resource_loader.BlockUntilLoaded());
    CHECK(resource_loader.loaded());
    ui::RegisterPathProvider();
    base::File pak_file = resource_loader.ReleaseFile(resource_file_);
    base::File pak_file_2 = pak_file.Duplicate();
    ui::ResourceBundle::InitSharedInstanceWithPakFileRegion(
        std::move(pak_file), base::MemoryMappedFile::Region::kWholeFile);
    ui::ResourceBundle::GetSharedInstance().AddDataPackFromFile(
        std::move(pak_file_2), ui::SCALE_FACTOR_100P);

// Initialize the skia font code to go ask fontconfig underneath.
#if defined(OS_LINUX) && !defined(OS_ANDROID)
    font_loader_ = skia::AdoptRef(new font_service::FontLoader(shell));
    SkFontConfigInterface::SetGlobal(font_loader_.get());
#endif

    // There is a bunch of static state in gfx::Font, by running this now,
    // before any other apps load, we ensure all the state is set up.
    gfx::Font();
}

} // namespace views
